Codemod folly::make_unique to std::make_unique
Codemod folly::make_unique to std::make_unique

Summary: `folly::make_unique` is going away. `std::make_unique` is here to stay.

Reviewed By: yfeldblum

Differential Revision: D5160295

fbshipit-source-id: 5b7c933b79233c3586dfab09ff7eb91045bf4d45

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